Mathquizily - Personalized math tests
NumberDrop - A uniquely challenging math puzzle game.
Mathway - Mathway is a freemium math solving app that helps you find the solutions to any math problem you can imagine.
Sum Fun - A fun number puzzle game for iPhone and iPad.
Delta: Math helper - With Delta: Math helper, quickly solve any math problem with an algorithm. Save time checking your homework or studying for a test, it’s free!
HoDoKu - HoDoKu is a sudoku helper written in Java and available in English and German.